Evidence of spin density wave in LaFeAsO, the parent material of the new Fe-based oxypnictide superconductors

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dc.creatorIshikado, Motoyuki
dc.creatorKajimoto, Ryoichi
dc.creatorShamoto, Shin-ichi
dc.creatorArai, Masatoshi
dc.creatorIyo, Akira
dc.creatorMiyazawa, Kiichi
dc.creatorShirage, Parasharam M.
dc.creatorKito, Hijiri
dc.creatorEisaki, Hiroshi
dc.creatorKim, SungWng
dc.creatorHosono, Hideo
dc.creatorGuidi, Tatiana
dc.creatorBewley, Robert
dc.creatorBennington, Stephen M.
dc.date2008-09-30
dc.date2008-10-02
dc.date.accessioned2026-07-07T10:06:33Z
dc.date.available2026-07-07T10:06:33Z
dc.descriptionThe Fe-based Oxypnicide superconductors have generated a huge amount of interest; they are a high temperature superconductor, with a Tc of 55K, but do not have the two dimensional copper oxygen layer that was thought essential for superconductivity at these high temperatures. Initial studies have hinted towards the possibility of a spin density wave (SDW) in these compounds and how they could play an important role in the superconductivity. SDW's occur at low temperatures in low-dimensional materials with strong electron correlations or in metals with a high density of states at the Fermi surface. A transition to the SDW state has many similarities to the superconducting transition, driven by the condensation energy with an energy gap opening, and in many materials the SDW state occurs adjacent in the phase diagram to the superconducting state. In these materials it is believed that electron doping suppresses the SDW instability allowing superconductivity to emerge. In this paper we report on the first direct experimental evidence of a SDW in the LaFeAsO parent compound as observed with inelastic neutron scattering. We show that these excitation derive from a two-dimensional Fermi surface nesting with a nesting vector of (π,π,0).
dc.description10 pages, 4 figures; Corrected typos
dc.identifierhttps://arxiv.org/abs/0809.5128
dc.identifierhttp://arxiv.org/abs/0809.5128
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/170366
dc.subjectSuperconductivity
dc.titleEvidence of spin density wave in LaFeAsO, the parent material of the new Fe-based oxypnictide superconductors
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